Google's Core Web Vitals — LCP, INP, and CLS — are now direct ranking signals. Slow, janky websites don't just frustrate users; they lose visibility.
Largest Contentful Paint (LCP) measures how fast your main content loads. Target: under 2.5 seconds. Premium agencies optimize images, fonts, and critical rendering paths to hit this.
Interaction to Next Paint (INP) measures responsiveness. Buttons that lag feel broken. Clean code and minimal JavaScript keep interactions instant.
Cumulative Layout Shift (CLS) measures visual stability. Nothing erodes trust faster than content jumping around while you try to click.
At Mars Agency, we benchmark every launch against these metrics and include performance scores in our delivery reports. A beautiful site that loads slowly is a beautiful liability.
Ask your agency for before-and-after Lighthouse scores. If they can't provide them, that's telling.